title: An ADC-free adaptive interface circuit of resistive sensor for electronic nose system.
abstract: The initial resistance of chemiresistive gas sensors could be affected by temperature, humidity, and background odors. In a sensing system, the traditional interface circuit always requires an ADC to convert analog signal to digital signal. In this paper, we propose an ADC-free adaptive interface circuit for a resistive gas sensor to read sensor signal and cancel the baseline drift. Furthermore, methanol was used to test the proposed interface circuit, which was connected with a FIGARO® gas sensor. This circuit was fabricated by TSMC 0.18 µm CMOS process, and consumed 86.41 µW under 1 V supply voltage.
authors.forename: Chia-Lin
authors.initials: CL
authors.lastname: Chang
authors.forename: Shih-Wen
authors.initials: SW
authors.lastname: Chiu
authors.forename: Kea-Tiong
authors.initials: KT
authors.lastname: Tang
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D062609:Electronic Nose; D006801:Humans; D006813:Humidity; D013696:Temperature; D014159:Transducers